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Pressure control system for a hydraulic lift and flotation system

  • US 8,401,745 B2
  • Filed: 09/01/2009
  • Issued: 03/19/2013
  • Est. Priority Date: 09/01/2009
  • Status: Active Grant
First Claim
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1. A hydraulic lift and flotation system comprising:

  • a hydraulic cylinder to provide lift and flotation functionality for a machine;

    a pump to circulate a hydraulic fluid in the hydraulic lift and flotation system;

    a relief valve in fluid communication with the pump, the relief valve providing general pressure regulation in the hydraulic lift and flotation system;

    an unload valve in fluid communication with the pump and a controller, the unload valve controlling pressurization in the hydraulic lift and flotation system;

    a solenoid configured and positioned to control opening and closing of the unload valve;

    the controller programmed to execute a control algorithm to provide control instructions to the solenoid to control the unload valve; and

    the control instructions operating the solenoid to close the unload valve over a period of time to control a rate of pressure rise in the hydraulic lift and flotation system until a predetermined pressure is obtained.

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